Physics-
General
Easy

Question

The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milli-watt. What should be the value of the resistanceR, connected in series with the diode, for obtaining maximum current?

  1. 1.5 capital omega    
  2. 5 capital omega    
  3. 6.67 capital omega    
  4. 200 capital omega    

The correct answer is: 5 capital omega


    R equals fraction numerator V o l t a g e blank d r o p over denominator C u r r e n t end fraction
    thereforeCurrent in circuit, I equals fraction numerator P over denominator V end fraction equals fraction numerator 100 cross times 10 to the power of negative 3 end exponent over denominator 0.5 end fraction equals 0.2 A
    R equals fraction numerator 1 over denominator 0.2 end fraction equals 5 blank capital omega

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